Malicious PDF — malware analysis report

Static analysis result for SHA-256 155a79cae1683eda…

MALICIOUS

PDF

91.8 KB Created: 2021-08-17 03:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 96939a0b1f99dfa0e6c4b8dd3377866f SHA-1: 0a952f5dd8aea6d272403f9fa4c03075b21b9b70 SHA-256: 155a79cae1683eda4e5ee2be007e7c564a39a67871a99d56f58aae394c21d993
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains hosting PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the document is part of a scheme to drive traffic to potentially malicious or phishing-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c58defe1---vedoxubowufosalifasabup.pdf In PDF document text
    • https://growyourmoney.in/userfiles/files/navisugakegisakojugifo.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/39149351651.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/pasevarinijibodozomebi.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/devoxetiti.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5ac99e92cd9ac8dea393268fcd1ae1a8/1742149538.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/41966954695.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/zufudujumugesere.pdfIn PDF document text
    • https://dm288.com/slicice/file/78629080871.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/79654052388.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/tevumiruvedadibabalu.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160918e9e523f6---64557912730.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/gunixidufuvinovilifikax.pdfIn PDF document text
    • https://aneri12.eu/res/file/jegetomewuzedew.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/16732984177.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/627db001f53a538177e1d1a5b15f953d/wesabidipozegimisujiz.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/11235386305.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/15517687754.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/ruzidaborixaxofawakimib.pdfIn PDF document text
    • http://praguetransfer.com/files/file/votujulewujaruvogis.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b436a8c898---72101868459.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/ruxupamotazelanujav.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/2539186271.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d551rekai7fmbnc4cnhh2habt2/berudisorakugiwavasuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=maytag+bravos+quiet+series+300+washer+not+drainingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A3 11420 bytes
SHA-256: f67a64c511cfdeca6b3c183606711910b14466344e5166a86d884bfe95010d19
font_02_sfnt_off00013324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13324 17828 bytes
SHA-256: e0bd63f73f42e27f99c3e8be4a6e5ed83dfea4c706f06e96785012c8ae0892a0